My dad (a scientist/atheist) had extremely high blood pressure that was not being controlled with prescription meds (even though he was taking 3 different kinds of blood pressure meds! )
I read on webMD that meditation with a mantra helps reduce blood pressure. I asked my dad to do an experiment. First, to take his blood pressure. He did. It was 179/76. Then I asked him to chant "Nam-myoho-renge-kyo" with me for 15 minutes (it is a Buddhist chant that means "dedication to the mystical/inexplicable Law of Cause and Effect through sound/vibration"). He only chanted for 7 minutes and then wanted to take his blood pressure again, immediately. He did, and his blood pressure was 105/67.
We tried this experiment every day for a week. Every time, it worked to lower his blood pressure.
Chanting definitely reduces blood pressure. I have also used chanting to relieve anxiety, reduce depression and to access the subconscious mind. Try it and see!!! It's free and it works.